I don't know what to say about that. I just would protect them at all costs. It's not that hard.I found, when I first brought home four ducks, that they acted quite traumatized. It took a long time for them to do normal duck things when we were present.
Currently, don't think they use their duck house at all, which I can't figure out. They're put up in a mostly secure run overnight.
I was letting my ducks free range, and I intend to again. However, I've lost four ducks to the same fox. It attacks during the later afternoon, around 430. It listens for their chattering I'm sure, and since they always congregate in areas where there's bushes, it just sneaks up and snatches one. Ducks make super easy prey
...little does the fox know that the tables may have turned...